Chance of a dog dying from anesthesia?

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It’s too late to ask them I found out a while ago

Any animal (or person) can die from complications related to anesthesia, and the risks rise for older individuals or those with underlying health issues.

By taking certain precautions, you can lower the chances. Doing things like running pre-anesthtic bloodwork, placing an IV catheter for venous access during surgery, being placed on IV fluid supplementation, and having an experienced anesthesiologist will all help to reduce the risk.